<template>
  <div class="app">
    <h3>我是App组件</h3>
    <Suspense>
      <template v-slot:default>
        <Child/>
      </template>
      <template v-slot:fallback>
        <h3>稍等，加载中...</h3>
      </template>
    </Suspense>
    <Child/>
  </div>
</template>

<script>
// import Child from  './components/Child.vue' // 静态引入
import { defineAsyncComponent } from 'vue';
const Child = defineAsyncComponent(()=>import('./components/Child'))// 异步引入
export default {
  name: "App",
  components: {Child},
}
</script>

<style>
  .app{
    background-color: gray;
    padding: 10px;
  }
</style>